Question

Which colour of the light has the longest wavelength?

Answer 1

Answer:

red has longest wave length

Answer 2

Answer:

Red colour of light has longest wavelength.

Explanation:

This can be proved experimentally.

When a beam of white light is allowed to pass through an equiangular prism, violet colour light gets most deviated and red colour light gets least deviated. The deviation of colour decreases when we move from violet to red. And since red is at top and is bent least,it has longest wavelength.

We know that deviation is inversely proportional to wavelength.

Thus red gets least deviated hence it has longest wavelength.

Hence, red colour is used in danger signals because it does not gets scattered in fog or any ither situations.

So red colour light has longest wavelength.